Abstract: A circuit and methods including super-twisting sliding mode controller (ST-SMC) control of an AC/DC quasi single-stage current-fed resonant converter for electric vehicle (EV) charging. The converter includes primary side switches and a secondary side bidirectional switch, achieving zero-voltage switching (ZVS) for efficient operation. The primary side includes an active clamp circuit, while the secondary side incorporates a resonant tank for smooth energy transfer. The ST-SMC generates pulse width modulation signals, ensuring ZVS at turn ON and turn OFF for primary switches, and ZVS at turn ON with low-voltage switching at turn OFF for the bidirectional switch. The circuit includes a feedback loop with an error calculation unit for precise control of grid current and output voltage, providing power factor correction and regulated output for 400V and 800V EV batteries.

Abstract: A resonance conversion device including an LLC synchronous resonance converter, a synchronous rectification controller, and a dead time adjustment circuit is provided. The LLC synchronous resonance converter includes a resonance tank and multiple synchronous rectification switches. The synchronous rectification controller controls the synchronous rectification switches, which are turned on with a delay based on a dead time length. The dead time adjustment circuit inductively couples electric energy at an output of the LLC synchronous resonance converter to the resonance tank, and provides a dead time control signal according to a resonance voltage variation of the resonance tank so that the synchronous rectification controller adjusts the dead time length according to the dead time control signal.

Abstract: A power factor correction converter includes a rectifier, a power factor correction controller, a power stage circuit, and a feedback circuit, wherein the power factor correction converter converts an AC voltage into an output voltage. The power factor correction controller includes an analog-to-digital converter, a digital peak-hold circuit, a reference voltage generator, an error amplifier, and a pulse-width modulation circuit, wherein the power factor correction controller generates a driving signal according to a rectification signal and a feedback signal. The digital peak-hold circuit includes a delay circuit, a digital rising detector, a tracking register, a digital falling detector, and a holding register, wherein the digital peak-hold circuit generates a peak signal according to a digital input signal.

Abstract: A power conversion device includes: a switching circuit; a signal generator to generate a switching signal of a switching element based on a first instruction value; a current controller to generate a second instruction value based on a deviation between a current target value and the current flowing through the switching circuit such that the current flowing through the switching circuit approaches the current target value; an operation mode detector to detect an operation mode based on the first instruction value; and a compensator to adjust the second instruction value so as to compensate a gain between the deviation and an amount of a change in the current of the switching circuit. The compensator adjusts the second instruction value so as to suppress a change in the gain based on the operation mode, and outputs the first instruction value.

Abstract: A drive circuit, an electronic device, and a method of controlling a drive circuit that can reduce power consumption. The drive circuit includes: a control circuit that controls application of an AC voltage to a capacitive load; an inductive element which constitutes a closed circuit along with the capacitive load; a diode , which is connected in series to the inductive element between the capacitive load and the inductive element so as to constitute the closed circuit; and a switch element, which is connected in series to the diode between the capacitive load and the inductive element so as to constitute the closed circuit.

Abstract: A control circuit for a power converter apparatus includes a reference voltage source that generates a predetermined reference voltage; an output voltage detection circuit having a capacitor that charges the output voltage or a corresponding voltage, the output voltage detection circuit detecting a drop in the output voltage based on a voltage across the capacitor; a feedback voltage output circuit including two voltage-divider resistors connected in series with each other with a voltage divider ratio set according to the reference voltage and the output voltage, the feedback voltage output circuit outputting a feedback voltage obtained by dividing the output voltage; a voltage comparison circuit that compares the reference voltage with the feedback voltage, and outputs a comparison result signal; and a drive control circuit configured to control intermittent operation in accordance with the comparison result signal and a detection signal of the output voltage detection circuit.

Abstract: Disclosed herein is a modular, scalable, and galvanically isolated power electronics converter topology for medium voltage AC (MVAC) to DC or high voltage AC (HVAC) to DC power conversion. A disclosed modular converter can comprise a low-voltage direct current bus and a centralized controller configured to regulate the low-voltage direct current bus. The modular converter can further comprise a plurality of three-phase blocks connected in series. Individual three-phase blocks of the plurality of three-phase blocks can comprise a plurality of single-phase modules connected in an input-series output-parallel configuration. The modular converter can further comprise a filter connected between a grid input and the plurality of three-phase blocks and a pulse-width modulator configured to generate encoded gate pulses for the individual three-phase blocks of the plurality of three-phase blocks.

Abstract: An electrical converter for conversion between a three-phase AC signal and a DC signal may include a phase selector for connecting the three phase terminals to a first, a second, and a third intermediate node, a first buck circuit having a first switch-node terminal connected to the first DC terminal, and a second buck circuit having a second switch-node terminal connected to the second DC terminal. The first and second buck circuits convert a voltage at the first, second, and third intermediate node to a voltage between the first and second DC terminal. The first and second buck circuits are connected in series between the first and second intermediate node, and include at least one actively switchable device connected between the common node and the third intermediate node.

Abstract: A PFC correction circuit includes first, second, and third phase inputs coupled to three-phase power mains, with a three-phase full-wave rectifying bridge connected to an input node. First, second, and third boost inductors are respectively connected between first, second, and third phase inputs and first, second, and third taps of the three-phase full-wave rectifying bridge. A boost switch is connected between the input node and ground, and a boost diode is connected between the input node and an output node. A multiplier input driver generates a single-phase input signal as a replica of a signal at the three-phase power mains after rectification. A single-phase power factor controller generates a PWM signal from the single-phase input signal. A gate driver generates a gate drive signal from the PWM signal. The boost switch is operated by the gate drive signal.

Abstract: A circuit for supplying an error signal to a controller in a boost or SEPIC DC-DC converter includes first, second, and third Zener diodes, first, second, and third resistors, and a MOSFET or BJT switch. The circuit includes, connected to a common voltage input source, a first branch including the switch, the first Zener diode and the first resistor, a second branch including the second Zener diode and the second resistor. The first and second branches are mutually connected to the third resistor, and the third resistor is connected to the controller. A third branch includes the third Zener diode and connections to the base or gate of the switch and ground. Each of the first, second, and third Zener diodes are reverse-biased. The second and third Zener voltages are equal and higher than the first Zener voltage.

Abstract: A three-phase AC solid-state transformer is provided which comprises three DC-DC converters. Each of the DC-DC converters has an internal transformer for galvanic isolation between its input and output sides. Each of the DC-DC converters has unipolar voltage across its input terminals and unipolar voltage across its output terminals. In one embodiment, the positive input terminals of the three DC-DC converters serve respectively as the three AC input terminals of the solid-state transformer and their positive output terminals provide the three phase AC output of the solid-state transformer. The negative input terminals of the three DC-DC converters are connected together to form a first common node, while the negative output terminals are connected together to form a second common node. The first common node has a voltage offset from the neutral of the input AC phases; and the second common node has a voltage offset from the neutral of the output AC phases.

Abstract: A rectifier circuit includes a switch circuit including at least one bidirectional switch and configured to rectify an alternating-current voltage of an alternating-current voltage line, and a surge suppression circuit connected to the alternating-current voltage line and configured to suppress a surge voltage of the switch circuit, where a dead time when the bidirectional switch is turned off is present.

Abstract: A power path switch circuit includes: a power transistor unit including: a first vertical double-diffused metal oxide semiconductor (VDMOS) device, wherein a first current outflow end of the first VDMOS device is coupled to an output end of a power path; and a second VDMOS device, wherein a first current inflow end of the first VDMOS device and a second current inflow end of the second VDMOS device are coupled with a supply end of the power path; and a voltage locking circuit coupled to the first current outflow end and the second current outflow end, for locking a voltage at the second current outflow end to a voltage at the first current outflow end, so that there is a predetermined ratio between a first conductive current flowing through the first VDMOS device and a second conductive current flowing through the second VDMOS device.

Abstract: A power supply circuit includes a first regulator and a second regulator. The first regulator is configured to generate a first output signal according to an input signal. A voltage value of the first output signal decreases according to the input signal and a first voltage threshold value at a power-off stage. The second regulator is configured to be enabled according to the first output signal to generate a second output signal according to the input signal. A voltage value of the second output signal decreases according to the input signal and a second voltage threshold value at the power-off stage. The second voltage threshold value is greater than the first voltage threshold value.

Abstract: According to an aspect of the invention, a motor drive circuit includes a first energy storage device configured to supply electrical energy, a bi-directional DC-to-DC voltage converter coupled to the first energy storage device, a voltage inverter coupled to the bi-directional DC-to-DC voltage converter, and an input device configured to receive electrical energy from an external energy source. The motor drive circuit further includes a coupling system coupled to the input device, to the first energy storage device, and to the bi-directional DC-to-DC voltage converter. The coupling system has a first configuration configured to transfer electrical energy to the first energy storage device via the bi-directional DC-to-DC voltage converter, and has a second configuration configured to transfer electrical energy from the first energy storage device to the voltage inverter via the bi-directional DC-to-DC voltage converter.

Abstract: A power converter includes an arm in which a plurality of converter cells are connected in series, each of the converter cells including at least two switching elements, a power storage element, and a pair of output terminals. A control device controls the power converter. The converter cell includes a switch to have the converter cell bypassed. When the control device senses failure of the converter cell, it has the failed converter cell within the arm bypassed and controls a normal converter cell within the arm to suppress a ratio of a harmonic component in an arm current that increases due to the failure.

Abstract: An electric power supply includes a totem pole bridgeless PFC power converter. The PFC power converter includes an input for coupling to an AC power source, an output, four switching devices coupled between the input and the output, two diodes coupled between the four switching devices and the input, a first inductor coupled between the four switching devices and the two diodes, and a second inductor coupled between the two diodes and the input. Other example electric power supplies and totem pole bridgeless PFC power converters are also disclosed.

Abstract: A power conversion apparatus and a synchronous rectification controller thereof are provided. At least one of a differentiation operation and an integration operation is performed on a drain voltage signal of a synchronous rectification transistor. According to at least one of a differential signal obtained by performing the differential operation and an integral signal obtained by performing the integral operation, it is determined whether to turn on the synchronous rectification transistor at the next time when the drain voltage signal is less than or equal to a turn-on threshold voltage.

Abstract: Disclosed herein is a hybrid resonant capacitor circuit including a first capacitor configured to discharge resonant current to interrupt a load current to a switch in parallel with the hybrid resonant capacitor circuit, a second capacitor coupled in parallel with the first capacitor, wherein the second capacitor is configured to transfer energy stored in the second capacitor to the first capacitor after discharge of the resonant current from the first capacitor, and a current limiter coupled in series with the second capacitor. A static transfer switch including a thyristor switch and the hybrid resonant capacitor circuit is also disclosed herein, as is a method for facilitating multiple consecutive voltage source transfers between a first voltage source and a second voltage source powering a load, using the hybrid resonant capacitor circuit.

Abstract: An alternating current to direct current conversion circuit includes a rectifier circuit, a first DC to DC conversion module and a second DC to DC conversion module. The first DC to DC conversion module includes multiple power switches and an inductor and is coupled between the rectifier circuit and the second DC to DC conversion module. Multiple power switches in the first DC to DC conversion module are controlled to be turned on simultaneously, so that a voltage across each of the power switches in the first DC to DC conversion module is reduced. The alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

Abstract: An alternating current to direct current conversion circuit includes N first power converters instead of a boost circuit including a power switch with a high withstand voltage. The N first power converters each have an input end and theses input ends are connected in series, to perform power factor correction. Therefore, the alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

Abstract: During a first mode of operation, a zero current detect (ZCD) signal is asserted in response to detecting a zero current condition at a switch node of a power converter. The power converter enters a light load mode of operation when the ZCD signal is asserted between a beginning point and a trigger point of a period of a PWM signal. A compensator voltage is generated based on a feedback voltage indicative of an output voltage. The compensator voltage is compared to a threshold voltage that represents a limit for the compensator voltage during the light load mode of operation determined over a range of the output voltage. The power converter exits the light load mode back to the first mode of operation in response to the compensator voltage being beyond the threshold voltage.

Abstract: A charging system includes an AC-DC converter for connecting to AC mains; a DC-link connected to the AC-DC converter output; and a DC-DC converter having an input coupled to the AC-DC converter output, a control input, and an output. The DC-DC converter includes drive circuitry for controlling the DC-DC converter. A controller has a feedforward input for receiving a signal corresponding to a voltage across the DC-link, a feedback input for receiving a signal corresponding to an output current provided by the DC-DC converter, and an output coupled to the control input of the DC-DC converter. The controller generates a control signal which controls the drive circuitry based upon a positive half cycle and a negative half cycle of ripple voltage at the DC-link, and a ripple current amplitude at the DC-DC converter output during at least one of the positive half cycle or the negative half cycle.

Abstract: A driving circuit including a reference voltage generator to generate a reference voltage based on an operating frequency of a complementary circuit; a comparator including a first input configured to receive a drain-to-source voltage of a field effect transistor; and a second input to receive the reference voltage; and a signal generator to deliver a driving signal to a gate terminal of the field effect transistor to drive the field effect transistor to an ON state after the drain-to-source voltage of the first low side field effect transistor becomes less than the reference voltage and to an OFF state after the drain-to-source voltage of the field effect transistor becomes greater than the reference voltage.

Abstract: A phase sequence adjustment system includes a power conversion circuit and a control circuit. The power conversion circuit is connected to a main power supply with a phase sequence. The control circuit respectively provides a first and a second excitation signals to the power conversion circuit, so as to short the power conversion circuit with the main power supply twice. The control circuit includes a current detection circuit and a control unit. The current detection circuit obtains two current signals respectively during two short-circuit operations. The control unit calculates two current phase angles respectively according to these two current signals and determines whether the phase sequence is positive or negative accordingly. The control unit selects one from the two current phase angles, calculates a voltage phase angle of the main power and a phase angle difference there-between to adjust a feedback phase sequence accordingly.

Abstract: A control circuit includes: an output terminal configured to be coupled to a control terminal of a transistor that has a current path coupled to an inductor; a transconductance amplifier configured to produce a sense current based on a current flowing through the current path of the transistor; and a first capacitor, where the control circuit is configured to: turn on the transistor based on a clock signal, integrate the sense current with an integrating capacitor to generate a first voltage, generate a second voltage across the first capacitor based on a first current, generate a second current based on the second voltage, generate a third voltage based on the second current, turn off the transistor when the first voltage becomes higher than the third voltage; discharge the integrating capacitor when the transistor turns off; and regulate an average output current flowing through the inductor based on the first current.

Abstract: A system includes a receiver coil configured to be magnetically coupled to a transmitter coil, a rectifier connected to the receiver coil, a first stage and a second stage connected in cascade between the rectifier and a load and a bias voltage source configured to be connected with a first voltage node through a first switch and a second voltage node through a second switch, wherein one of the first voltage node and the second voltage node supplies power to the bias voltage source.

Abstract: A boost converting apparatus includes a boost converter and a passive lossless snubber, wherein the passive lossless snubber includes an input-end unidirectional conduction component, a resonant inductor, a resonant capacitor, and an output-end unidirectional conduction component. The present disclosure can solve the problems that the energy conversion efficiency of the hard-switching boost converter is poor and the structure of the soft-switching boost converter is complicated.

Abstract: A power device includes a power factor corrector, an auxiliary capacitor, a switching device, an auxiliary boost circuit, a controller and a voltage conversion device. The switching device has a first end electrically connected to the output end of the power factor corrector, and a second end electrically connected to one end of the auxiliary capacitor. An output end of the auxiliary boost circuit is electrically connected to the output end of the power factor corrector, an input end of the auxiliary boost circuit is electrically connected to a middle end of the switching device, and a ground end of the auxiliary boost circuit is electrically connected to another end of the auxiliary capacitor. The controller is electrically connected to the switching device and the auxiliary boost circuit. The input end of the voltage conversion device is electrically connected to the output end of the power factor corrector.

Abstract: A modular direct current power source is provided. One welding power supply system includes a plurality of hysteretic buck converters coupled in parallel. The hysteretic buck converters are configured to receive a common input and to provide combined output power to a common load based upon the common input.

Abstract: An electric working machine according to one aspect of the present disclosure comprises a motor, a rectifier circuit, a capacitor, a series switching element, a resistive element, a drive circuit, a peak voltage value acquirer, and a controller. The capacitor smooths power rectified by the rectifier circuit. The series switching element is coupled in series with the capacitor. The resistive element is coupled in parallel with the series switching element. The controller brings the series switching element into conduction in a case where AC power is inputted to the rectifier circuit and where a specified conducting condition based on a peak voltage value acquired by the peak voltage value acquirer is satisfied.

Abstract: A power conversion device includes first and second current detectors. A coil is connected a first power terminal through the first and second current detectors. A first switch has a source terminal connected to the coil and a second semiconductor switch has a drain terminal connected to the coil. A first diode is connected between a drain terminal of the first semiconductor switch and a second power supply terminal. A second diode is connected between a source terminal of the second semiconductor switch and the second power terminal. A capacitor is connected in parallel with the first and second diodes. A control circuit is configured to turn the first and second semiconductor switches on or off based on current detections of the first and second current detectors.

Abstract: An active bridge rectifying control apparatus includes a bridge rectifying unit and a rectifying control module. The rectifying control module includes a phase control unit, a low-side drive unit, and a self-drive unit. The phase control unit provides a live line signal and a ground line signal according to a positive half cycle and a negative half cycle of an AC power source. The low-side drive unit provides a low-side control signal according to the live line signal and the ground line signal. The self-drive unit establishes a drive voltage according to the positive half cycle and the negative half cycle of the AC power source, and provides a high-side control signal according to the low-side control signal. The bridge rectifying unit rectifies the AC power source into a DC power source according to the low-side control signal, the high-side control signal, and the drive voltage.

Abstract: A filter capacitor discharge circuit includes a high-voltage terminal, a signal preparation circuit, a low-pass filter, a voltage level detector, a timer unit, and a switch unit. The signal preparation circuit receives a detection signal corresponding to an AC voltage from the high-voltage terminal, and generates a voltage signal according to the detection signal. The low-pass filter provides a filtered signal according to the voltage signal. The voltage level detector checks whether a voltage difference between the voltage signal and the filtered signal is less than a predetermined value. When the voltage difference is less than the predetermined value, the timer unit performs time calculation to accumulate a timing result. When the timing result exceeds a predetermined time, the switch unit is turned on so that the firster capacitor is discharged through the switch unit.

Abstract: Disclosed is a voltage converter capable of adaptively operating in one of a synchronous mode and an asynchronous mode according to an input voltage of an input terminal. The voltage converter includes: a voltage detector generating a detection result according to the input voltage; a switch control circuit generating a first switch control signal and a second switch control signal according to the detection result and an output voltage of an output terminal; a first switch intermittently turned on according to the first switch control signal in the synchronous and asynchronous modes; a second switch intermittently turned on/off according to the second switch control signal in the synchronous/asynchronous mode; and an energy storage circuit electrically connected to the input and output terminals to store and release energy according to the on-off states of the first and second switches.

Abstract: A control circuit includes: a flip-flop having an output configured to be coupled to a control terminal of a transistor and for producing a first signal; a comparator having an output coupled to an input of the flip-flop, and first and second inputs for receiving first and second voltages, respectively; a transconductance amplifier having an input for receiving a sense voltage indicative of a current flowing through the transistor, and an output coupled to the first input of the comparator; a zero crossing detection (ZCD) circuit having an input configured to be coupled to a first current path terminal of the transistor and to an inductor, where the ZCD circuit is configured to detect a demagnetization time of the inductor and produce a third signal based on the detected demagnetization time; and a reference generator configured to generate the second voltage based on the first and third signals.

Abstract: A power supply capable of protecting a rectifier circuit using a switching element from an overvoltage or an overcurrent is provided. The power supply includes a power input terminal; an output capacitor; a synchronous rectifier configured to rectify an AC voltage input through the power input terminal; a converter configured to convert the rectified AC voltage into a DC voltage following a preset voltage and supply the DC voltage to the output capacitor; and a protection circuit provided between the power input terminal and the output capacitor, and configured to supply an AC voltage higher than the voltage charged in the output capacitor to the output capacitor by bypassing the synchronous rectifier.

Abstract: A direct power converter includes a converter that rectifies a single-phase AC voltage, converts AC power into DC power, and outputs first instantaneous power; a power buffer circuit that receives and supplies power between the converter and a DC link and that performs buffering second instantaneous power; and an inverter that converts a DC voltage at the DC link into a second AC voltage and outputs the second AC voltage. A period for which a current that flows from the converter to the power buffer circuit continuously flows in a period shorter than a half-period of the AC voltage is longer when third power input to the inverter, fourth power output by the inverter, or an average value of the first instantaneous power decreases to a value which is less than a first threshold, from a value which is greater than or equal to a second threshold that is greater than or equal to the first threshold.

Abstract: An induction heating device includes a first resonance circuit comprising a first working coil and a first resonance capacitor, a first inverter electrically connected to the first resonance circuit and configured to perform a first switching operation to thereby apply a first resonance current to the first working coil, a first group of snubber capacitors that are configured to be electrically connected to the first inverter, the first group of snubber capacitors comprising a first snubber capacitor and a second snubber capacitor, and a first relay configured to selectively connect the first group of snubber capacitors to the first inverter.

Abstract: A converter for converting a three-phase AC input into a DC output may include three phase input terminals and two output terminals, a phase selector for connecting the three-phase AC input to an upper intermediate node, a lower intermediate node, and a middle intermediate node. The phase selector includes semiconductor switches for selectively connecting the middle intermediate node to the three phase input terminals, and a controller. The electrical converter includes a boost circuit and a buck-boost circuit. The boost circuit includes an upper boost circuit, a lower boost circuit, and a common node. The buck-boost circuit has an output connected to the two output terminals in parallel with an output of the boost circuit, and includes at least two semiconductor switches that are actively switchable and connected in series across the output terminals. The middle intermediate node is connected to a common node of the two second semiconductor switches.

Abstract: A multi-phase power factor converter is disclosed. In embodiments, each phase of the power factor converter includes a voltage measurement circuit, a boost coil, a current measurement circuit, and a comparator. The voltage measurement circuit is configured to detect an input voltage. The current measurement circuit configured to detect a current in the boost coil. The comparator configured to compare the input voltage to the current in the boost coil, and a plurality of transistors (e.g., forming a MOSFET bridge) are driven by an output of the comparator.

Abstract: A switched mode power supply (SMPS) includes a filter, a power factor correction (PFC) circuit, and a control circuit configured to determine various electrical parameters of the SMPS. In some embodiments, the control circuit is configured to determine a power line frequency and an AC input voltage based on an AC line voltage and an AC neural voltage. In other embodiments, the control circuit is configured to determine an AC input current based on a reactive current flowing through the filter and a PFC AC current. In further embodiments, the control circuit is configured to report a value of an electrical parameter if value is determined to be accurate. Other example switch mode power supplies, control circuits and methods are also disclosed.

Abstract: A boost converter with high power factor includes a bridge rectifier, a divider and filter circuit, a capacitive adjustment circuit, an induction circuit, a multiplier, a power switch element, a PWM (Pulse Width Modulation) IC (Integrated Circuit), an output stage circuit, and a feedback circuit. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The divider and filter circuit generates a divided voltage according to the rectified voltage. The output stage circuit generates an output voltage. The feedback circuit generates a feedback voltage according to the output voltage. The multiplier generates a product voltage difference according to the divided voltage and the feedback voltage. The capacitive adjustment circuit is enabled or disabled according to the feedback voltage. The induction circuit selectively provides a compensation current according to the product voltage difference.

Abstract: A power supply device with low loss includes an input switch circuit, a transformer, a first capacitor, an output stage circuit, and a detection and control circuit. The input switch circuit generates a switching voltage according to an input voltage. The output stage circuit generates an output voltage. The output stage circuit includes a first rectifying switch element and a second rectifying switch element. The detection and control circuit detects a first output current flowing through the first rectifying switch element so as to generate a first control voltage, and it detects a second output current flowing through the second rectifying switch element so as to generate a second control voltage. The first rectifying switch element is selectively closed or opened according to the first control voltage. The second rectifying switch element is selectively closed or opened according to the second control voltage.

Abstract: According to one embodiment, the controller configured to, when an operation of the boosting circuit is in the boosting mode, and if an instantaneous value Ia of a current flowing through the reactor lowers to a value smaller than or equal to a set value Ias, switch the operation of the boosting circuit from the boosting mode to the non-boosting mode.

Abstract: Controlling gate-source voltage with a gate driver in a secondary-side integrated circuit (IC) controller for a secondary-controlled AC-DC converter is described. In an example embodiment, the gate driver is configured to programmably control the gate-source voltage and the slew rate of a secondary-side provider field effect transistor (FET) in the converter.

Abstract: Resonant power converters. Example embodiments are methods of operating a rectification controller including sensing a drain-source voltage of a synchronous rectification (SR) field effect transistor (FET); setting an adaptive delay time corresponding to a time interval between a first state transition and a second state transition, with each of the first and second state transitions corresponding to the drain-source voltage transitioning between being greater than the adaptive delay voltage and being less than the adaptive delay voltage; and driving the SR FET to a conductive state after the drain-source voltage having been less than the on-threshold voltage for longer than the adaptive delay time.

Abstract: A light-emitting diode (LED) luminaire emergency driver comprises a rechargeable battery, a power supply unit, an LED driving circuit, a first control circuit, and a second control circuit. The LED driving circuit and the power supply unit each comprises a scalable power control scheme respectively configured to drive external LED arrays with different power levels when the alternate-current (AC) mains are unavailable and to power the first control circuit and to charge the rechargeable battery with different capacity when the AC mains are available. The second control circuit comprises two switches configured to control discharging and charging of the rechargeable battery. The second control circuit further comprises a relay switch circuit configured to control either a first LED driving current from the LED driving circuit or a second LED driving current from an external power supply unit to drive the external LED arrays without crosstalk.

Abstract: Disclosed is a display device including a power factor corrector including a converter correcting a power factor of an input power and a controller controlling the converter, a power transformer converting power, of which a power factor is corrected by the power factor corrector, and a display panel receiving power through the power transformer to display an image. The controller controls the converter to increase a first voltage when the first voltage output through the converter is less than a specified voltage. Other various embodiments as understood from the specification are also possible.

Abstract: Disclosed is a power factor correction circuit including a plurality of legs connected in parallel and each leg including two switching devices connected in series, a plurality of inductors, each inductor having one terminal connected to an interconnection node of the two switching devices in a corresponding one of the plurality of legs, and a controller configured to control on/off states of the switching devices of the plurality of legs in a pulse width modulation manner such that each of the inductors of the plurality of inductors is built up twice or more in one switching period of the switching devices when an alternating current (AC) voltage is input to the other terminal of each inductor of the plurality of inductors.